EP0026264A1 - Apparatus for welding thermoplastic articles - Google Patents

Apparatus for welding thermoplastic articles Download PDF

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Publication number
EP0026264A1
EP0026264A1 EP80103621A EP80103621A EP0026264A1 EP 0026264 A1 EP0026264 A1 EP 0026264A1 EP 80103621 A EP80103621 A EP 80103621A EP 80103621 A EP80103621 A EP 80103621A EP 0026264 A1 EP0026264 A1 EP 0026264A1
Authority
EP
European Patent Office
Prior art keywords
melting channel
filler material
perforated body
bores
central bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP80103621A
Other languages
German (de)
French (fr)
Other versions
EP0026264B1 (en
Inventor
Karl Bemelmann
Hubert Koch
Norbert Jablonski
Siegfried Lenck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to AT80103621T priority Critical patent/ATE6228T1/en
Publication of EP0026264A1 publication Critical patent/EP0026264A1/en
Application granted granted Critical
Publication of EP0026264B1 publication Critical patent/EP0026264B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/40—Applying molten plastics, e.g. hot melt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/022—Melting the material to be shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/861—Hand-held tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools

Definitions

  • the present invention relates to a device for welding objects made of thermoplastics by means of a filler material, with a feed device for the filler material, an adjoining heating chamber, in the interior of which a melting channel for plasticizing the filler material is arranged.
  • the object of the present invention is therefore to design the device in such a way that continuous plasticization of the filler material is ensured.
  • a perforated body acting as a barrier is provided at the outlet of the melting channel, such that the filler material remains in the melting channel until a continuous plasticization is achieved.
  • the melting channel consists of a plurality of bores running parallel and interconnected.
  • the longitudinal bores are provided on a circle of bores and are assigned to one another in such a way that they are connected to a common central bore to form the melting channel.
  • a continuously heated plasticized filler material is advantageously obtained.
  • the filler material is briefly divided into individual "strands" which, however, immediately mix again to form a common strand.
  • the perforated body thus advantageously brings about an excellent mixing of the filler material, so that it can enter the weld joint in the optimal state for plastic welding.
  • the plastic welding device 10 shown schematically in FIG. 1 has a handle 12 on which a head 16 receiving the feed device 14 is arranged.
  • the feed device 14 is driven by a gear motor (not shown) housed in the handle 12.
  • a welding shoe holder 26 with welding shoe 28 is arranged at the lower end of the heating chamber 24 in FIG. 1, from which (28) the filler material 22 plasticized in the heating chamber 24 emerges in the form of a strand.
  • the temperature of the strand is controlled by a thermometer 30.
  • the heating chamber 24 is shown in several views.
  • the heating chamber 24 consists of a block in the form of a block, in the interior of which two diametrically opposed elongated holes 32 are provided, which serve to receive the heating cartridges (not shown) for plasticizing the filler material.
  • a melting channel 34 for guiding the filler material 22 is provided centrally between the two elongated holes 32.
  • This melting channel 34 has a cross section, cf. Fig. 4, a shamrock shaped shape. This shape is obtained by - in the exemplary embodiment - four parallel longitudinal bores 38 which are arranged on a common bore circle 36 and which are separated from one another by intermediate webs 40 but open into a common, longitudinal central bore 42 to form the melting channel 34.
  • the filler material 22 is conveyed through this central bore 42 by means of the feed device 14 (as will be explained in more detail later) (from top to bottom in FIG. 2).
  • the central bore has a taper 43 at its lower end.
  • the threaded bores 41 on the end sides of the heating chamber 24 serve to receive screw connections by means of which the heating chamber 24 is connected to the head 16 (FIG. 5) or the welding shoe holder 26 (FIG. 6).
  • the lower end of the melting channel 34 has an outlet 44 which is conical and serves to receive a perforated body 46 according to the invention.
  • This perforated body is shown as a detail in FIGS. 7 and 8.
  • the perforated body 46 consists of a circular base plate 48 with edge bores 50 arranged on a common pitch circle. Ridges 54 are formed between these edge bores and the central bore 52.
  • the webs 54 as shown in particular in FIG. 7, have two stages, where a wall 58 forms with the (inner extended) rib group 56 for the central bore 52 and the outer (lower) ridge set 60 in connection with the inner rib group 56, a channel-shaped, semi-ended extension of the R andbohritch 50th
  • cutouts 62 are provided, into which the intermediate webs 40 engage when the perforated body 46 is installed. Due to this mutual arrangement of the intermediate webs 40 with respect to the cut-outs 62, the perforated body 46 is positioned in its installed position.
  • the perforated body 46 is arranged in the outlet 44 of the melting channel 34 in such a way that the base plate 48 bears against the lower end of the heating chamber 24 and the outer web group 60 is also sealingly received by a cylindrical wall 59 (the outlet 44) . This ensures that the plasticized filler material flows through the edge bores 50.
  • the central bore 42 merges into the taper 43, which in turn opens into the central bore 52 of the perforated body 46. From the taper 43, the longitudinal bores are no longer connected to the central bore 42, but end as individual separate bores, which continue through the intermediate webs 40 are separated from each other, cf. see also Fig. 6.
  • the perforated body 46 is now arranged in the outlet 44 in such a way that the millings 62 of the inner web group 56 are aligned with the intermediate webs 40.
  • the longitudinal bores 38 are thus above the inner web groups 56 and partly above the outer peripheral bores 50 of the perforated body, so that the filler material can flow from these longitudinal bores in the direction of the perforated body.
  • the wire-shaped filler material When the device is in operation, the wire-shaped filler material is now pushed through the melting channel 34 by means of the feed device 14 and then emerges in a plasticized form from the welding shoe 28.
  • the filler material moves in the area of the central bore 42 of the melting channel, during the passage of which it is heated and thereby plasticized.
  • the filler material which is flowable as a result of the heating, reaches the welding shoe 28 via the taper 43 at the lower end of the central bore 42 and via the central bore 52 of the perforated body 46. This process would in itself be the ideal case. Practice shows, however, that part of the wire-shaped filler material is not or only insufficiently plasticized. As mentioned, only a plasticized filler material can flow through the taper 43.
  • the non-plasticized part accumulates in the central bore 42 and - since filler material is still being fed in - is deflected to all sides (comparatively like a cord that swings to all sides) and thereby reaches the longitudinal bores 38 connected to the central bore 42. in which the still cold filler material is also heated. Due to the deflection of the wire-shaped filler material in all longitudinal bores, this is a continuous one Feed movement ensured without an increased effort on the feed device 14 is required despite a high rate of plasticized filler material.
  • the web group 56 and in connection with the smaller diameter of the edge bores 50 oppose the filler material escaping from the longitudinal bores 38 with a flow resistance in such a way that it is ensured that only continuously heated and thus completely plasticized filler material serves as " Lock "acting perforated body can overcome.
  • the filler material continuously plasticized in this way according to the invention now flows through the bores 50, 52 of the perforated body 46 and is thereby briefly divided into individual strands, which, however, expand again immediately after exiting the bores and unite to form a common, continuously plasticized strand which then exits over the welding shoe.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

1. Apparatus for welding thermoplastic articles by means of a filler material, with an advancing facility for the filler material, an adjoining heating chamber in the internal part of which a melting channel is arranged for the plasticizing of the filler material, characterized in that the melting channel (34) consists of several bores (38, 42) running in parallel and being connected with each other and that at the outlet (44) of the melting channel (34) a hole body (46) is provided which acts as throttle such that the filler material (22) remains so long in the melting channel (34) until a continuous plasticizing is achieved.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zum Verschweißen von Gegenständen aus Thermoplasten mittels eines Zusatzwerkstoffes, mit einer Vorschubeinrichtung für den Zusatzwerkstoff, einer sich daran anschließenden Heizkammer, in deren Innern ein Schmelzkanal zur Plastifizierung des Zusatzwerkstoffes angeordnet ist.The present invention relates to a device for welding objects made of thermoplastics by means of a filler material, with a feed device for the filler material, an adjoining heating chamber, in the interior of which a melting channel for plasticizing the filler material is arranged.

Eine derartige Vorrichtung ist bereits aus der DE-OS 25 44 492 als bekannt zu entnehmen. Bei dieser Vorrichtung ist ein verhältnismäßig großer Kraftaufwand der Vorschubeinrichtung für den Transport des Zusatzwerkstoffes innerhalb der Heizkammer erforderlich. Darüber hinaus besteht immer wieder die Gefahr, daß nicht ausreichend plastifizierter Zusaztwerkstoff aus der Vorrichtung austritt, was schlechte Schweißverbindungen zur Folge haben kann.Such a device is already known from DE-OS 25 44 492. In this device, a relatively large effort of the feed device is required for the transport of the filler material within the heating chamber. In addition, there is always the risk that insufficiently plasticized additional material emerges from the device, which leads to poor welded connections Can have consequences.

Aufgabe der vorliegenden Erfindung ist es daher, die Vorrichtung so zu gestalten, daß eine durchgehende Plastifizierung des Zusatzwerkstoffes gewährleistet ist.The object of the present invention is therefore to design the device in such a way that continuous plasticization of the filler material is ensured.

Zur Lösung der genannten Aufgabe wird gemäß der Erfindung vorgeschlagen, daß am Austritt des Schmelzkanales ein als Sperre wirkender Lochkörper vorgesehen ist, derart, daß der Zusatzwerkstoff solange im Schmelzkanal verbleibt, bis eine durchgehende Plastifizierung erreicht ist.To achieve the stated object, it is proposed according to the invention that a perforated body acting as a barrier is provided at the outlet of the melting channel, such that the filler material remains in the melting channel until a continuous plasticization is achieved.

Bei der bevorzugten Ausführungsform der Erfindung ist hierbei vorgesehen, daß der Schmelzkanal aus mehreren, parallel verlaufenden und untereinander verbundenen Bohrungen besteht.In the preferred embodiment of the invention it is provided that the melting channel consists of a plurality of bores running parallel and interconnected.

Hierbei ist es dann von besonderem Vorteii, wenn die Längsbohrungen auf einem Bohrungskreis vorgesehen und so einander zugeordnet sind, daß sie mit einer gemeinsamen Zentralbohrung zur Bildung des Schmelzkanales verbunden sind.It is particularly advantageous here if the longitudinal bores are provided on a circle of bores and are assigned to one another in such a way that they are connected to a common central bore to form the melting channel.

Weitere erfindungsgemäße Vorteile ergeben sich aus den übrigen Unteransprüchen.Further advantages according to the invention result from the remaining subclaims.

Durch die erfindungsgemäße Anordnung eines als Sperre wirkenden Lochkörpeisin Verbindung mit der besonderen Gestaltung des Schmelzkanales wird in vorteilhafter Weise ein durchgehend erwärmter plastifizierter Zusatzwerkstoff erhalten. Durch die den Schmelzkanal bildenden und untereinander verbundenen Bohrungen wird somit, auf Grund der dadurch sich ergebenden größeren Schmelzkanalfläche eine erhöhte Wärmemenge an den Zusatzwerkstoff, zu dessen vollständiger Plastifizierung innerhalb des Schmelzkanales abgegeben. Durch den am austrittsseitigen Ende des Schmelzkanales vorgesehenen Lochkörper erfolgt eine kurzzeitige Aufteilung des Zusatzwerkstoffes in einzelne "Stränge", die sich aber sofort wieder zu einem gemeinsamen Strang vermischen. Der Lochkörper bewirkt somit in vorteilhafter Weise neben seiner Funktion als Sperre auch eine ausgezeichnete Vermischung des Zusatzwerkstoffes, so daß dieser in dem für die Kunststoff-Schweißung optimalen Zustand in die Schweißfuge eintreten kann.Through the arrangement according to the invention of a perforated body acting as a barrier in connection with the special design of the melting channel, a continuously heated plasticized filler material is advantageously obtained. Through the holes forming the melting channel and interconnected, due to the resulting larger melting channel area, an increased amount of heat is added to the filler material for its complete plasticization within the melting channel submitted. Due to the perforated body provided at the outlet end of the melting channel, the filler material is briefly divided into individual "strands" which, however, immediately mix again to form a common strand. In addition to its function as a barrier, the perforated body thus advantageously brings about an excellent mixing of the filler material, so that it can enter the weld joint in the optimal state for plastic welding.

Weitere Vorteile ergeben sich aus der nachstehenden Beschreibung einer bevorzugten Ausführungsform der Erfindung in Verbindung mit der beigefügten Zeichnung, in der dargestellt sind, in

  • Fig.1 eine schematische Teilansicht einer Kunststoff-Schweißvorrichtung;
  • Fig.2 einen Längsschnitt durch die Heizkammer;
  • Fig.3 die Anordnung des Lochkörpers am Ende der Heizkammer;
  • Fig.4 eine Schnittansicht entlang der Linie IV-IV in Fig.2 im vergrößertem Maßstab;
  • Fig.5 eine obere Endansicht der Heizkammer gemäß Fig.2;
  • Fig.6 eine untere Endansicht der Heizkammer ohne Lochkörper;
  • Fig.7 eine vergrößerte Schnittansicht des Lochkörpers;
  • Fig.8 eine Endansicht des Lochkörpers aus Fig.7 und
  • Fig.9 eine Projektion des Schmelzkanales auf dem Lochkörper.
Further advantages result from the following description of a preferred embodiment of the invention in conjunction with the attached drawing, in which are shown in
  • 1 shows a schematic partial view of a plastic welding device;
  • 2 shows a longitudinal section through the heating chamber;
  • 3 shows the arrangement of the perforated body at the end of the heating chamber;
  • 4 shows a sectional view along the line IV-IV in FIG. 2 on an enlarged scale;
  • 5 shows an upper end view of the heating chamber according to FIG. 2;
  • 6 shows a lower end view of the heating chamber without perforated body;
  • 7 shows an enlarged sectional view of the perforated body;
  • 8 shows an end view of the perforated body from FIG. 7 and
  • 9 shows a projection of the melting channel on the perforated body.

Die in Fig.1 schematisch dargestellte Kunststoff-Schweißvorrichtung 10 weist einen Handgriff 12 auf, an dem ein die Vorschubeinrichtung 14 aufnehmender Kopf 16 angeordnet ist. Die Vorschubeinrichtung 14 besteht aus Führungs-und Antriebsrollen 18 bzw. 20, mittels denen der Kunststoff-Schweißdraht (=Zusatzwerkstoff) 22 in Richtung zur sich anschließenden Heizkammer 24 vorwärtsbewegt wird. Der Antrieb der Vorschubeinrichtung 14 erfolgt über einen (nicht dargestellten) im Handgriff 12 untergebrachtem Getriebemotor. An dem in Fig.1 unteren Ende der Heizkammer 24 ist ein Schweißschuhhalter 26 mit Schweißschuh 28 angeordnet, aus dem (28) der in der Heizkammer 24 plastifizierte Zusatzwerkstoff 22 in Form eines Stranges austritt. Die Temperatur des Stranges wird über ein Thermometer 30 kontrolliert.The plastic welding device 10 shown schematically in FIG. 1 has a handle 12 on which a head 16 receiving the feed device 14 is arranged. The feed device 14 consists of guide and drive rollers 18 or 20, by means of which the plastic welding wire (= filler material) 22 is moved forward in the direction of the adjoining heating chamber 24. The feed device 14 is driven by a gear motor (not shown) housed in the handle 12. A welding shoe holder 26 with welding shoe 28 is arranged at the lower end of the heating chamber 24 in FIG. 1, from which (28) the filler material 22 plasticized in the heating chamber 24 emerges in the form of a strand. The temperature of the strand is controlled by a thermometer 30.

In den Fig.2-6 ist die Heizkammer 24 in mehreren Ansichten dargestellt. Wie ersichtlich, besteht die Heizkammer 24 aus einem quaderförmigen Block, in.dessen Innern zwei einander diametral gegenüberliegende Langlöcher 32 vorgesehen sind, welche zur Aufnahme der (nicht gezeichneten) Heizpatronen für die Plastifizierung des Zusatzwerkstoffes dienen.2-6, the heating chamber 24 is shown in several views. As can be seen, the heating chamber 24 consists of a block in the form of a block, in the interior of which two diametrically opposed elongated holes 32 are provided, which serve to receive the heating cartridges (not shown) for plasticizing the filler material.

Wie die Fig.2 und 5 zeigen, ist zwischen den beiden Langlöchern 32 zentrisch ein Schmelzkanal 34 zur Führung des Zusatzwerkstoffes 22 vorgesehen. Dieser Schmelzkanal 34 hat im Querschnitt, vgl. hierzu Fig.4, eine kleeblattförmige Form. Diese Gestalt wird erhalten durch - im Ausführungsbeispiel - vier parallel verlaufende und auf einem gemeinsamen Bohrungskreis 36 angeordnete Längsbohrungen 38, die durch Zwischenstege 40 voneinander getrennt aber in einer gemeinsamen, längsverlaufenden Zentralbohrung 42 zur Bildung des Schmelzkanales 34 münden. Durch diese Zentralbohrung 42 wird mittels der Vorschubeinrichtung 14 - wie dies später noch näher erläutert wird - der Zusatzwerkstoff 22 (in Fig.2 von oben nach unten) gefördert. Die Zentralbohrung hat, wie Fig.2 zeigt, an ihrem unteren Ende eine Verjüngung 43.As FIGS. 2 and 5 show, a melting channel 34 for guiding the filler material 22 is provided centrally between the two elongated holes 32. This melting channel 34 has a cross section, cf. Fig. 4, a shamrock shaped shape. This shape is obtained by - in the exemplary embodiment - four parallel longitudinal bores 38 which are arranged on a common bore circle 36 and which are separated from one another by intermediate webs 40 but open into a common, longitudinal central bore 42 to form the melting channel 34. The filler material 22 is conveyed through this central bore 42 by means of the feed device 14 (as will be explained in more detail later) (from top to bottom in FIG. 2). As shown in FIG. 2, the central bore has a taper 43 at its lower end.

Die an den Endseiten der Heizkammer 24 vorhandenen Gewindebohrungen 41 dienen zur Aufnahme von Schraubverbindungen, mittels denen die Heizkammer 24 mit dem Kopf 16 (Fig.5) bzw. dem Schweißschuhhalter 26 (Fig.6) verbunden wird.The threaded bores 41 on the end sides of the heating chamber 24 serve to receive screw connections by means of which the heating chamber 24 is connected to the head 16 (FIG. 5) or the welding shoe holder 26 (FIG. 6).

Es ist selbstverständlich, daß anstelle der "vierblättrigen Kleeblattform" des Schmelzkanals 34, dieser auch erfindungsgemäß in einer anderen Querschnittsform gestaltet sein kann, z.B. mit drei oder sechs Längsbohrungen 38 o.ä.It goes without saying that instead of the "four-leaf clover shape" of the melting channel 34, this can also be designed according to the invention in a different cross-sectional shape, e.g. with three or six longitudinal holes 38 or similar

Wie Fig.2 und vergrößert Fig.3 zeigen, weist das untere Ende des Schmelzkanales 34 einen Austritt 44 auf, welcher konisch gestaltet ist und zur Aufnahme eines erfindungsgemäßen Lochkörpers 46 dient. Dieser Lochkörper ist als Einzelheit in den Fig.7 und 8 dargestellt.As shown in FIG. 2 and enlarged in FIG. 3, the lower end of the melting channel 34 has an outlet 44 which is conical and serves to receive a perforated body 46 according to the invention. This perforated body is shown as a detail in FIGS. 7 and 8.

Der Lochkörper 46 besteht aus einer kreisrunden Grundplatte 48 mit auf einem gemeinsamen Teilkreis angeordneten Randbohrungen 50. Zwischen diesen Randbohrungen und der Mittelbohrung 52 sind Stege 54 ausgebildet. Die Stege 54 sind, wie insbesondere Fig.7 zeigt, zweistufig, wobei die (innere längere) Steggruppe 56 eine Wandung 58 für die Mittelbohrung 52 und die äußere (kleinere) Steggruppe 60 in Verbindung mit der inneren Steggruppe 56 eine kanalförmige, halbseitig geschlossene Verlängerung der Randbohrungen 50 bildet.The perforated body 46 consists of a circular base plate 48 with edge bores 50 arranged on a common pitch circle. Ridges 54 are formed between these edge bores and the central bore 52. The webs 54, as shown in particular in FIG. 7, have two stages, where a wall 58 forms with the (inner extended) rib group 56 for the central bore 52 and the outer (lower) ridge set 60 in connection with the inner rib group 56, a channel-shaped, semi-ended extension of the R andbohrungen 50th

Am oberen (in Fig.7 linken) Ende der inneren Steggruppe 56 sind Einfräsungen 62 vorgesehen, in die im eingebauten Zustand des Lochkörpers 46 die Zwischenstege 40 eingreifen. Durch diese gegenseitige Anordnung der Zwischenstege 40 bezüglich der Einfräsungen 62 ist der Lochkörper 46 in seiner Einbaulage positioniert.At the upper (left in FIG. 7) end of the inner web group 56, cutouts 62 are provided, into which the intermediate webs 40 engage when the perforated body 46 is installed. Due to this mutual arrangement of the intermediate webs 40 with respect to the cut-outs 62, the perforated body 46 is positioned in its installed position.

Wie insbesondere Fig.3 zeigt, ist der Lochkörper 46 so im Austritt 44 des Schmelzkanales 34 angeordnet, daß die Grundplatte 48 am unteren Stirnende der Heizkammer 24 anliegt und weiterhin die äußere Steggruppe 60 dichtend von einer zylindrischen Wandung 59 (des Austrittes 44) aufgenommen ist. Auf diese Weise ist sichergestellt, daß der plastifizierte Zusatzwerkstoff durch die Randbohrungen 50 fließt.As shown in FIG. 3 in particular, the perforated body 46 is arranged in the outlet 44 of the melting channel 34 in such a way that the base plate 48 bears against the lower end of the heating chamber 24 and the outer web group 60 is also sealingly received by a cylindrical wall 59 (the outlet 44) . This ensures that the plasticized filler material flows through the edge bores 50.

Die erfindungsgemäße Anordnung des Lochkörpers 46 in Bezug auf den Schmelzkanal 34 läßt sich am besten anhand der Fig.9 erläutern, in welcher die Kontur des Schmelzkanales 34 mit dicken Vollinien,die Gestalt des Lochkörpers der Übersicht halber mit dünnen Vollinien dargestellt ist.The arrangement according to the invention of the perforated body 46 with respect to the melting channel 34 can best be explained with reference to FIG. 9, in which the contour of the melting channel 34 is shown with thick solid lines, the shape of the perforated body with thin solid lines for the sake of clarity.

Am unteren Ende des Schmelzkanales geht die Zentralbohrung 42 in die Verjüngung 43 über, die ihrerseits in die Mittelbohrung 52 des Lochkörpers 46 mündet. Ab der Verjüngung 43 sind die Längsbohrungen nun nicht mehr mit der Zentralbohrung 42 verbunden, sondern enden als einzelne separate Bohrungen, die durch die Zwischenstege 40 weiterhin voneinander getrennt sind, vgl. hierzu auch Fig.6.At the lower end of the melting channel, the central bore 42 merges into the taper 43, which in turn opens into the central bore 52 of the perforated body 46. From the taper 43, the longitudinal bores are no longer connected to the central bore 42, but end as individual separate bores, which continue through the intermediate webs 40 are separated from each other, cf. see also Fig. 6.

Der Lochkörper 46 ist nun so im Austritt 44 angeordnet, daß die Einfräsungen 62 der inneren Steggruppe 56 mit den Zwischenstegen 40 ausgerichtet sind. Wie aus Fig.9 ersichtlich, stehen somit die Längsbohrungen 38 oberhalb der inneren Steggruppen 56 als auch zum Teil über den äußeren Randbohrungen 50 des Lochkörpers, so daß der Zusatzwerkstoff aus diesen Längsbohrungen in Richtung Lochkörper fließen kann.The perforated body 46 is now arranged in the outlet 44 in such a way that the millings 62 of the inner web group 56 are aligned with the intermediate webs 40. As can be seen from FIG. 9, the longitudinal bores 38 are thus above the inner web groups 56 and partly above the outer peripheral bores 50 of the perforated body, so that the filler material can flow from these longitudinal bores in the direction of the perforated body.

In Betrieb der Vorrichtung wird nun mittels der Vorschubeinrichtung 14 der drahtförmige Zusatzwerkstoff durch den Schmelzkanal 34 geschoben und tritt dann in plastifizierter Form aus dem Schweißschuh 28 aus. Der Zusatzwerkstoff bewegt sich dabei im Bereich der Zentralbohrung 42 des Schmelzkanales, bei deren Durchwanderung er erwärmt und dadurch plastifiziert wird. Der durch die Erwärmung fließfähige Zusatzwerkstoff gelangt über die Verjüngung 43 am unteren Ende der Zentralbohrung 42 und über die Mittelbohrung 52 des Lochkörpers 46 in den Schweißschuh 28. Dieser Ablauf wäre an sich der Idealfall. Die Praxis zeigt jedoch, daß ein Teil des drahtförmigen Zusatzwerkstoffes nicht oder nicht ausreichend plastifiziert wird. Durch die Verjüngung 43 kann - wie erwähnt - nur plastifizierter Zusatzwerkstoff fließen. Der nicht plastifizierte Teil hingegen staut sich in der Zentralbohrung 42 und wird - da ja weiterhin Zusatzwerkstoff nachgeschoben wird - nach allen Seiten hin, ausgelenkt (vergleichsweise wie eine nach allen Seiten schwingende Schnur) und gelangt dabei in die mit der Zentralbohrung 42 verbundenen Längsbohrungen 38, in denen der noch kalte Zusatzwerkstoff ebenfalls erwärmt wird. Aufgrund der Ablenkung des drahtförmigen Zusatzwerkstoffes in alle Längsbohrungen ist somit eine kontinuierliche Vorschubbewegung sichergestellt, ohne daß dabei trotz einer hohen Ausbringungsrate an plastifizierten Zusatzwerkstoff ein erhöhter Kraftaufwand an der Vorschubeinrichtung 14 erforderlich wird.When the device is in operation, the wire-shaped filler material is now pushed through the melting channel 34 by means of the feed device 14 and then emerges in a plasticized form from the welding shoe 28. The filler material moves in the area of the central bore 42 of the melting channel, during the passage of which it is heated and thereby plasticized. The filler material, which is flowable as a result of the heating, reaches the welding shoe 28 via the taper 43 at the lower end of the central bore 42 and via the central bore 52 of the perforated body 46. This process would in itself be the ideal case. Practice shows, however, that part of the wire-shaped filler material is not or only insufficiently plasticized. As mentioned, only a plasticized filler material can flow through the taper 43. The non-plasticized part, on the other hand, accumulates in the central bore 42 and - since filler material is still being fed in - is deflected to all sides (comparatively like a cord that swings to all sides) and thereby reaches the longitudinal bores 38 connected to the central bore 42. in which the still cold filler material is also heated. Due to the deflection of the wire-shaped filler material in all longitudinal bores, this is a continuous one Feed movement ensured without an increased effort on the feed device 14 is required despite a high rate of plasticized filler material.

Wie Fig.9 zeigt, setzt die Steggruppe 56 und in Verbindung mit den ihrem Durchmesser kleineren Randbohrungen 50 dem aus den Längsbohrungen 38 entweichenden Zusatzwerkstoff einen Strömungswiderstand entgegen, dergestalt, daß dadurch gewährleistet ist, daß nur durchgehend erwärmter und damit völlig plastifizierter Zusatzwerkstoff diesen als "Sperre" wirkenden Lochkörper überwinden kann.As FIG. 9 shows, the web group 56 and in connection with the smaller diameter of the edge bores 50 oppose the filler material escaping from the longitudinal bores 38 with a flow resistance in such a way that it is ensured that only continuously heated and thus completely plasticized filler material serves as " Lock "acting perforated body can overcome.

Der auf diese erfindungsgemäße Weise durchgehend plastifizierte Zusatzwerkstoff fließt nunmehr durch die Bohrungen 50, 52 des Lochkörpers 46 und wird dadurch kurzfristig in einzelne Stränge aufgeteilt, die aber nach Austreten aus den Bohrungen sofort wieder expandieren und sich zu einem gemeinsamen, durchgehend plastifizierten Strang vereinen, der dann über den Schweißschuh austritt.The filler material continuously plasticized in this way according to the invention now flows through the bores 50, 52 of the perforated body 46 and is thereby briefly divided into individual strands, which, however, expand again immediately after exiting the bores and unite to form a common, continuously plasticized strand which then exits over the welding shoe.

Claims (10)

1. Vorrichtung zum Verschweißen von Gegenständen aus Thermoplasten mittels eines Zusatzwerkstoffes, mit einer Vorschubeinrichtung für den Zusatzwerkstoff, einer sich daran anschließenden Heizkammer, in deren Innern ein Schmelzkanal zur Plastifizierung des Zusatzwerkstoffes.angeordnet ist,
dadurch gekennzeichnet,
daß am Austritt (44) des Schmelzkanales (34) ein als Sperre wirkender Lochkörper (46) vorgesehen ist, derart, daß der Zusatzwerkstoff (22) solange im Schmelzkanal (34) verbleibt, bis eine durchgehende Plastifizierung erreicht ist.1. Device for welding objects made of thermoplastics by means of a filler material, with a feed device for the filler material, an adjoining heating chamber, in the interior of which a melting channel for plasticizing the filler material is arranged.
characterized,
that a perforated body (46) acting as a barrier is provided at the outlet (44) of the melting channel (34), such that the filler material (22) remains in the melting channel (34) until a continuous plasticization is achieved. 2. Vorrichtung nach Anspruch J,
dadurch gekennzeichnet,
daß der Schmelzkanal (34) aus mehreren, parallel verlaufenden und untereinander verbundenen Bohrungen (38,42) besteht.2. Device according to claim J,
characterized,
that the melting channel (34) consists of several, parallel and interconnected holes (38,42). 3. Vorrichtung nach Anspruch 1 und/oder 2,
dadurch gekennzeichnet,
daß die Längsbohrungen (38) auf einem Bohrungskreis (36) vorgesehen und so einander zugeordnet sind, daß sie mit einer gemeinsamen Zentralbohrung (42) zur Bildung des Schmelzkanales (34) verbunden sind.3. Device according to claim 1 and / or 2,
characterized,
that the longitudinal bores (38) are provided on a bore circle (36) and are assigned to one another in such a way that they are connected to a common central bore (42) to form the melting channel (34). 4. Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß die Zentralbohrung (42) in einer Verjüngung (43) endet, welche nicht mehr mit den einzelnen Längsbohrungen (38) verbunden ist, und daß die Längsbohrungen (38) separat im Austritt (44) des Schmelzkanales (34) münden.4. Device according to one of the preceding claims,
characterized,
that the central bore (42) ends in a taper (43) which is no longer connected to the individual longitudinal bores (38), and that the longitudinal bores (38) open separately in the outlet (44) of the melting channel (34). 5. Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß der am Austritt (44) angeordnete Lochkörper (46) von einem sich anschließenden und an der Heizkammer (24) befestigtem Heizschuhhalter (26) in seiner Position gehalten ist.5. Device according to one of the preceding claims,
characterized,
that the perforated body (46) arranged at the outlet (44) is held in position by a heating shoe holder (26) which is adjoining and fixed to the heating chamber (24). 6. Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß der Lochkörper (46) aus einer kreisrunden Lochplatte (48) mit davon abstehenden Stegen (56,60) besteht und weiterhin eine Mittelbohrung (52) und diese umgebende Randbohrungen (50) aufweist.6. Device according to one of the preceding claims,
characterized,
that the perforated body (46) consists of a circular perforated plate (48) with webs (56, 60) projecting therefrom and also has a central bore (52) and peripheral bores (50) surrounding it. 7. Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß die Stege zweistufig ausgebildet sind, wobei die innere Steggruppe (56) eine gemeinsame Wandung (58) für die Mittelbohrung (52) und die äußere, kleinere Steggruppe (60) in Verbindung mit der inneren Steggruppe (56) eine kanalförmige, halbseitig geschlossene Verlängerung der.Randbohrungen (50) bildet.7. Device according to one of the preceding claims,
characterized,
that the webs are formed in two stages, the inner web group (56) having a common wall (58) for the central bore (52) and the outer, smaller web group (60) in connection with the inner web group (56) a channel-shaped, half-closed extension der.Edge bores (50). 8. Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß die äußere Steggruppe (60) des Lochkörpers (46) dichtend an der Wandung (59) des Austrittes (44) anliegt.8. Device according to one of the preceding claims,
characterized,
that the outer web group (60) of the perforated body (46) lies sealingly against the wall (59) of the outlet (44). 9. Vorrichtung nach einem der voranstehenden Ansprüche,
gekennzeichnet durch
die gegenseitige Anordnung von Schmelzkanal (34) und Lochkörper (46) derart, daß die Zwischenstege (40) des Schmelzkanales (34) und die Einfräsungen (62)der inneren Steggruppe (56) des Lochkörpers (46) zueinander ausgerichtet sind.9. Device according to one of the preceding claims,
marked by
the mutual arrangement of the melting channel (34) and the perforated body (46) such that the intermediate webs (40) of the melting channel (34) and the millings (62) of the inner web group (56) of the perforated body (46) are aligned with one another. 10.Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß die Längsbohrungen (38) der inneren Steggruppe (56) gegenüberliegend angeordnet sind und mit den Bohrungen (50) des Lochkörpers (46) in Verbindung stehen.10.Device according to one of the preceding claims,
characterized,
that the longitudinal bores (38) of the inner web group (56) are arranged opposite one another and are connected to the bores (50) of the perforated body (46).
EP80103621A 1979-08-20 1980-06-26 Apparatus for welding thermoplastic articles Expired EP0026264B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80103621T ATE6228T1 (en) 1979-08-20 1980-06-26 DEVICE FOR WELDING THERMOPLASTIC OBJECTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2933650A DE2933650A1 (en) 1979-08-20 1979-08-20 DEVICE FOR WELDING ITEMS FROM THERMOPLASTICS.
DE2933650 1979-08-20

Publications (2)

Publication Number Publication Date
EP0026264A1 true EP0026264A1 (en) 1981-04-08
EP0026264B1 EP0026264B1 (en) 1984-02-15

Family

ID=6078852

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80103621A Expired EP0026264B1 (en) 1979-08-20 1980-06-26 Apparatus for welding thermoplastic articles

Country Status (4)

Country Link
EP (1) EP0026264B1 (en)
AT (1) ATE6228T1 (en)
DE (1) DE2933650A1 (en)
NO (1) NO802154L (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6945152U (en) * 1969-11-18 1970-02-19 Hoechst Ag DEVICE FOR WELDING THERMOPLASTIC OBJECTS
DE2544492A1 (en) * 1975-10-04 1977-04-14 Hoechst Ag DEVICE FOR WELDING THERMOPLASTIC OBJECTS
DE2626560A1 (en) * 1976-06-14 1977-12-22 Munsch Pumpen App Erich Hand-held welding device for thermoplastics - has feed-in for solid material at unheated end and discharge for softened material at heated end
DE7815981U1 (en) * 1978-11-09 Munsch, Erich, 5432 Wirges Welding device, especially thick seam welding device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7815981U1 (en) * 1978-11-09 Munsch, Erich, 5432 Wirges Welding device, especially thick seam welding device
DE6945152U (en) * 1969-11-18 1970-02-19 Hoechst Ag DEVICE FOR WELDING THERMOPLASTIC OBJECTS
DE2544492A1 (en) * 1975-10-04 1977-04-14 Hoechst Ag DEVICE FOR WELDING THERMOPLASTIC OBJECTS
DE2626560A1 (en) * 1976-06-14 1977-12-22 Munsch Pumpen App Erich Hand-held welding device for thermoplastics - has feed-in for solid material at unheated end and discharge for softened material at heated end

Also Published As

Publication number Publication date
EP0026264B1 (en) 1984-02-15
ATE6228T1 (en) 1984-03-15
NO802154L (en) 1981-02-23
DE2933650A1 (en) 1981-03-12

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